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Carbene radicals, in which the carbene is bonded to an open-shell metal with the carbene carbon possessing a radical character. Carbene radicals have features of both Fischer and Schrock carbenes, but are typically long-lived reaction intermediates. The "second generation" of the Grubbs catalysts for alkene metathesis features an NHC ligand.
Examples include (CO) 5 W=COMePh and (OC) 5 Cr=C(NR 2)Ph. Orbital interaction in a Fisher carbene. The carbene electrons are donated to a sigma bond, and weak pi-backbonding occurs. Fisher carbene complexes are related to the singlet form of carbenes, where both electrons occupy the same sp 2 orbital at the carbon. This lone pair donates to a ...
A Fischer carbene is a type of transition metal carbene complex, which is an organometallic compound containing a divalent organic ligand. In a Fischer carbene, the carbene ligand is a σ-donor π-acceptor ligand. Because π-backdonation from the metal centre is generally weak, the carbene carbon is electrophilic.
The net reaction gives a transition metal carbene complex: L n M≡CR + HX → L n (X)M=CHR. These complexes can also undergo photochemical reactions. In some carbyne complexes, coupling of the carbyne ligand to a carbonyl is observed. Protonation of the carbyne carbon and conversion of the carbyne ligand into a π-allyl. [13]
Entitled Directory of Music Research Libraries, RISM series C lists in five volumes all the music libraries, archives, and private collections which house historical musical materials. Each institution described in Series C has a library siglum, which is an abbreviation to identify the institution where musical sources are located.
Répertoire International de Littérature Musicale (International Repertory of Music Literature; Internationales Repertorium der Musikliteratur), commonly known by its acronym RILM, is a nonprofit organization that offers digital collections and advanced tools for locating research on all topics related to music. [1]
Jacquelin Barber Toy, A Bibliography of English- and German-Language Music Periodicals Indexed Before 1949, in series of K.S.U. master's degree research documents, Sources of Music Periodical Indexing. N.B.: "A research report submitted to the Kent State University School of Library Science in partial fulfillment of the requirements for the ...